1 | /* |
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2 | * libcucul Canvas for ultrafast compositing of Unicode letters |
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3 | * Copyright (c) 2006-2007 Sam Hocevar <sam@zoy.org> |
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4 | * All Rights Reserved |
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5 | * |
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6 | * $Id$ |
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7 | * |
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8 | * This library is free software. It comes without any warranty, to |
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9 | * the extent permitted by applicable law. You can redistribute it |
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10 | * and/or modify it under the terms of the Do What The Fuck You Want |
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11 | * To Public License, Version 2, as published by Sam Hocevar. See |
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12 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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13 | */ |
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14 | |
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15 | /* |
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16 | * This file contains functions for compressed file I/O. |
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17 | */ |
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18 | |
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19 | #include "config.h" |
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20 | |
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21 | #if !defined __KERNEL__ |
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22 | # include <stdio.h> |
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23 | # include <stdlib.h> |
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24 | # include <string.h> |
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25 | # if defined HAVE_ZLIB_H |
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26 | # include <zlib.h> |
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27 | # define READSIZE 128 /* Read buffer size */ |
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28 | # define WRITESIZE 128 /* Inflate buffer size */ |
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29 | # endif |
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30 | #endif |
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31 | |
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32 | #include "cucul.h" |
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33 | #include "cucul_internals.h" |
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34 | |
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35 | #if !defined __KERNEL__ && defined HAVE_ZLIB_H |
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36 | static int zipread(cucul_file_t *, void *, unsigned int); |
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37 | #endif |
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38 | |
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39 | #if !defined __KERNEL__ |
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40 | struct cucul_file |
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41 | { |
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42 | # if defined HAVE_ZLIB_H |
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43 | uint8_t read_buffer[READSIZE]; |
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44 | z_stream stream; |
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45 | gzFile gz; |
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46 | int eof, zip; |
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47 | # endif |
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48 | FILE *f; |
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49 | int readonly; |
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50 | }; |
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51 | #endif |
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52 | |
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53 | cucul_file_t *cucul_file_open(char const *path, const char *mode) |
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54 | { |
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55 | #if defined __KERNEL__ |
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56 | return NULL; |
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57 | #else |
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58 | cucul_file_t *fp = malloc(sizeof(*fp)); |
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59 | |
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60 | fp->readonly = !strchr(mode, 'r'); |
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61 | |
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62 | # if defined HAVE_ZLIB_H |
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63 | uint8_t buf[4]; |
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64 | unsigned int skip_size = 0; |
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65 | |
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66 | fp->gz = gzopen(path, fp->readonly ? "rb" : "wb"); |
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67 | if(!fp->gz) |
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68 | { |
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69 | free(fp); |
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70 | return NULL; |
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71 | } |
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72 | |
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73 | fp->eof = 0; |
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74 | fp->zip = 0; |
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75 | |
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76 | if(fp->readonly) |
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77 | { |
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78 | /* Parse ZIP file and go to start of first file */ |
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79 | gzread(fp->gz, buf, 4); |
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80 | if(memcmp(buf, "PK\3\4", 4)) |
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81 | { |
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82 | gzseek(fp->gz, 0, SEEK_SET); |
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83 | return fp; |
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84 | } |
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85 | |
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86 | fp->zip = 1; |
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87 | |
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88 | gzseek(fp->gz, 22, SEEK_CUR); |
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89 | |
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90 | gzread(fp->gz, buf, 2); /* Filename size */ |
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91 | skip_size += (uint16_t)buf[0] | ((uint16_t)buf[1] << 8); |
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92 | gzread(fp->gz, buf, 2); /* Extra field size */ |
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93 | skip_size += (uint16_t)buf[0] | ((uint16_t)buf[1] << 8); |
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94 | |
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95 | gzseek(fp->gz, skip_size, SEEK_CUR); |
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96 | |
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97 | /* Initialise inflate stream */ |
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98 | fp->stream.total_out = 0; |
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99 | fp->stream.zalloc = NULL; |
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100 | fp->stream.zfree = NULL; |
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101 | fp->stream.opaque = NULL; |
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102 | fp->stream.next_in = NULL; |
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103 | fp->stream.avail_in = 0; |
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104 | |
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105 | if(inflateInit2(&fp->stream, -MAX_WBITS)) |
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106 | { |
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107 | free(fp); |
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108 | gzclose(fp->gz); |
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109 | return NULL; |
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110 | } |
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111 | } |
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112 | # else |
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113 | fp->f = fopen(path, fmode); |
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114 | |
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115 | if(!fp->f) |
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116 | { |
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117 | free(fp); |
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118 | return NULL; |
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119 | } |
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120 | # endif |
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121 | |
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122 | return fp; |
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123 | #endif |
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124 | } |
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125 | |
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126 | int cucul_file_close(cucul_file_t *fp) |
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127 | { |
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128 | #if defined __KERNEL__ |
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129 | return 0; |
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130 | #elif defined HAVE_ZLIB_H |
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131 | gzFile gz = fp->gz; |
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132 | if(fp->zip) |
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133 | inflateEnd(&fp->stream); |
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134 | free(fp); |
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135 | return gzclose(gz); |
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136 | #else |
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137 | FILE *f = fp->f; |
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138 | free(fp); |
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139 | return fclose(f); |
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140 | #endif |
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141 | } |
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142 | |
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143 | size_t cucul_file_read(cucul_file_t *fp, void *ptr, size_t size) |
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144 | { |
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145 | #if defined __KERNEL__ |
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146 | return 0; |
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147 | #elif defined HAVE_ZLIB_H |
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148 | if(fp->zip) |
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149 | return zipread(fp, ptr, size); |
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150 | return gzread(fp->gz, ptr, size); |
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151 | #else |
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152 | return fread(ptr, 1, size, fp->f); |
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153 | #endif |
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154 | } |
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155 | |
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156 | size_t cucul_file_write(cucul_file_t *fp, const void *ptr, size_t size) |
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157 | { |
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158 | if(fp->readonly) |
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159 | return 0; |
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160 | |
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161 | #if defined __KERNEL__ |
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162 | return 0; |
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163 | #elif defined HAVE_ZLIB_H |
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164 | return gzwrite(fp->gz, ptr, size); |
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165 | #else |
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166 | return fwrite(ptr, 1, size, fp->f); |
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167 | #endif |
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168 | } |
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169 | |
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170 | char *cucul_file_gets(cucul_file_t *fp, char *s, int size) |
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171 | { |
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172 | #if defined __KERNEL__ |
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173 | return NULL; |
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174 | #elif defined HAVE_ZLIB_H |
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175 | if(fp->zip) |
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176 | { |
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177 | int i; |
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178 | |
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179 | for(i = 0; i < size; i++) |
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180 | { |
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181 | int ret = zipread(fp, s + i, 1); |
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182 | |
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183 | if(ret < 0) |
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184 | return NULL; |
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185 | |
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186 | if(ret == 0 || s[i] == '\n') |
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187 | { |
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188 | if(i + 1 < size) |
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189 | s[i + 1] = '\0'; |
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190 | return s; |
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191 | } |
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192 | } |
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193 | |
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194 | return s; |
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195 | } |
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196 | |
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197 | return gzgets(fp->gz, s, size); |
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198 | #else |
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199 | return fgets(s, size, fp->f); |
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200 | #endif |
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201 | } |
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202 | |
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203 | int cucul_file_eof(cucul_file_t *fp) |
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204 | { |
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205 | #if defined __KERNEL__ |
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206 | return 1; |
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207 | #elif defined HAVE_ZLIB_H |
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208 | return fp->zip ? fp->eof : gzeof(fp->gz); |
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209 | #else |
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210 | return feof(fp->f); |
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211 | #endif |
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212 | } |
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213 | |
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214 | #if !defined __KERNEL__ && defined HAVE_ZLIB_H |
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215 | static int zipread(cucul_file_t *fp, void *buf, unsigned int len) |
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216 | { |
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217 | unsigned int total_read = 0; |
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218 | |
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219 | if(len == 0) |
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220 | return 0; |
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221 | |
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222 | fp->stream.next_out = buf; |
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223 | fp->stream.avail_out = len; |
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224 | |
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225 | while(fp->stream.avail_out > 0) |
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226 | { |
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227 | unsigned int tmp; |
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228 | int ret = 0; |
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229 | |
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230 | if(fp->stream.avail_in == 0 && !gzeof(fp->gz)) |
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231 | { |
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232 | int bytes_read; |
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233 | |
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234 | bytes_read = gzread(fp->gz, fp->read_buffer, READSIZE); |
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235 | if(bytes_read < 0) |
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236 | return -1; |
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237 | |
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238 | fp->stream.next_in = fp->read_buffer; |
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239 | fp->stream.avail_in = bytes_read; |
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240 | } |
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241 | |
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242 | tmp = fp->stream.total_out; |
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243 | ret = inflate(&fp->stream, Z_SYNC_FLUSH); |
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244 | total_read += fp->stream.total_out - tmp; |
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245 | |
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246 | if(ret == Z_STREAM_END) |
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247 | { |
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248 | fp->eof = 1; |
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249 | return total_read; |
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250 | } |
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251 | |
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252 | if(ret != Z_OK) |
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253 | return ret; |
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254 | } |
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255 | |
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256 | return total_read; |
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257 | } |
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258 | #endif |
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259 | |
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